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lecture10 - CURRENT-VOLTAGE CHARACTERISTICS We will present...

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CURRENT-VOLTAGE CHARACTERISTICS We will present the current voltage characteristic for DC to low frequency operation of the Enhancement type MOSFET. Circuit Symbol Figure 4.10 (a) Circuit symbol for the n -channel enhancement-type MOSFET. (b) Modified circuit symbol with an arrowhead on the source terminal to distinguish it from the drain and to indicate device polarity (i.e., n channel). (c) Simplified circuit symbol to be used when the source is connected to the body or when the effect of the body on device operation is unimportant. The i D -v DS Characteristics Triode Region t GS V v (induced Channel) OV t GS v V v - Overdrive DS t GS v V v - t GD V v ( 29 - - = 2 2 1 ' DS DS t GS n D v v V v L W k i ( 29 small v v V v L W k i DS DS t GS n D ; ' - = ( 29 small v v L W k V v L W k r DS OV n t GS n DS ; ' 1 ' 1 = - = Saturation Region t GS V v (induced Channel) DS t GS v V v < - t GD V v < ( 29 2 ' 2 1 t GS n D V v L W
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